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Evaluation the effect of chitosan application on quantitative and qualitative characteristics of black cumin (Nigella sativa L.) under different irrigation regimes
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Mahdi Roshandel   , Masoumeh Naeemi * , Hamid Jabbari |
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Abstract: (1703 Views) |
Introduction: Water deficit is one of the limiting factors reducing plant production. Black cumin (Nigella sativa L.) is a medicinal and aromatic plant whose oil essence and fatty acid composition may be affected by drought stress. Due to Iran's climatic conditions, irrigation restriction is one of the factors decreasing black cumin yield and quality.
Materials and methods: To evaluate the effect of water deficit stress and chitosan foliar application on quantitative and qualitative characteristics of black cumin (Nigella sativa L.) a study was conducted based on the randomized complete block design with a factorial arrangement of treatments and three replications at Gonbad Kavous University research field, Iran in 2015-2016. In this study, the irrigation factor at four levels was irrigation after 70 mm evaporation from Class A evaporation pan (control), irrigation after 90 mm evaporation from Class A pan (mild stress), irrigation after 110 mm M evaporation from Class A evaporation pan (medium stress) and irrigation after 130 mm evaporation from evaporation pan (severe stress) were considered. The second factor was foliar spraying of chitosan at three levels of zero (spraying with pure water as a control treatment), spraying at 125 mg/l (in three stages of 6-8 leaves, 30 days after planting and before flowering), and foliar application at the rate of 250 mg/l (in three stages of 6-8 leaves, 30 days after planting and before flowering).
Results: The results showed that drought stress reduced plant height, number of sub-branches, and plant dry weight. Drought stress also had a negative effect on proline content, chlorophyll, and relative leaf water content. Spraying chitosan at a dose of 250 mg/l only increased the percentage and yield of the oil. Based on the results of the mean comparison in this study, no significant difference was observed between control irrigation, mild stress, and moderate stress in terms of grain yield per hectare and harvest index.
Conclusion: Since the chitosan foliar application on most of the measured traits was not significant and since its effects were not compatible with the report of other researchers, more research is necessary to confirm the effect of application of chitosan and the effect of foliar application on the black seeds under stress conditions. |
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| Keywords: Chlorophyll, Deficit water stress, Grain yield, Oil, Proline |
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Full-Text [PDF 658 kb]
(171 Downloads)
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Type of Study: Research |
Subject:
Ecophysiology
Received: 2024/03/16 | Accepted: 2024/03/18 | Published: 2024/03/18
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